[en] The consequences, or risks, from light-water reactor accidents have been evaluated as a function of containment building leakage rates. The analysis used the set of generic source terms and frequencies of occurrence developed as representative of the range of postulated types of accidents currently applied in reactor safety research, and the calculated result was the variable M/sub sp/, defined as the accident-spectrum-weighted impact fraction rate from containment building leakage. Explicitly, M/sub sp/ was formulated as the sum of fractional increases in consequences, due to the building leakage, for each type of accident weighted by its frequency of occurrence. The base case common to similar types of analyses was applied. The computed result was M/sub sp/ less than or equal to 1.5 x 10^-3 fractional increase in the accident spectrum risk per %/day containment building leakage rate